Ruppiaceae Horan.
  • Prim. Lin. Syst. Nat. 46. 1834. (2 Nov 1834)
  • Ditch-grass Family


Cite taxon page as 'WFO (2021): Ruppiaceae Horan. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-7000000535. Accessed on: 16 Oct 2021'

General Information

Plants perennial or annual, in saline, brackish, or extremely hard water, totally submerged. Rhizomes slender, usually branched. Stems terete, elongated or not. Leaves alternate, sessile, narrowly linear, entire or minutely denticulate toward apex; stipules adnate to leaf base and sheathing stems; sheaths shortly auriculate, ligule absent. Inflorescences of few-flowered spikes, pedunculate; spikes enclosed by involucral leaves at first; peduncles short at first but elongated in fruit. Flowers hermaphroditic, small, ebracteate. Perianth absent. Stamens 2; anthers sessile, extrorse, opening by longitudinal slits. Carpels 4 or more, free, 1-ovuled, sessile in flower but usually becoming narrowly stipitate in fruit; stigma sessile, peltate or umbonate. Fruit drupaceous, asymmetric, indehiscent. Seeds without endosperm.

  • Provided by: [E].Flora Of CHina @ efloras.org
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    Herbs, annual or rarely perennial, not rhizomatous, caulescent; turions absent [present]. Leaves alternate to subopposite, submersed, sessile; sheath not persisting longer than blade, not leaving circular scar when shed, not ligulate, not auriculate; blade linear; intravaginal squamules scales, 2. Inflorescences terminal, capitate spikes, with subtending spathe, pedunculate; peduncle following fertilization often elongating, often spiraling. Flowers bisexual; subtending bracts absent; perianth absent; stamens 2, in 1 series; anthers distinct, dehiscing longitudinally; pollen arcuate; pistils 4--16, distinct, stipitate; ovules parietal, campylotropous. Fruits drupaceous. Seeds 1; embryo straight.

  • Provided by: [A].Flora of North America @ efloras.org
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    • 4
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    Morphology

    Flowers hermaphrodite, small, in terminal spikes at first enclosed by the sheathing base of the leaves, at length much elongated; bracts and perianth absent

  • Provided by: [C].Plants Of the World Online Portal - FWTA
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    • 1
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    Leaves opposite or alternate, linear or setaceous, sheathing at the base

  • Provided by: [C].Plants Of the World Online Portal - FWTA
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    • 1
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    Stamens 2; filaments short, broad; anthers extrorse, loculi reniform and separated by the connective

  • Provided by: [C].Plants Of the World Online Portal - FWTA
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    • 1
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    Fruits long-stipitate with spirally twisted stalks, indehiscent

  • Provided by: [C].Plants Of the World Online Portal - FWTA
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    • 1
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    Seeds pendulous, without endosperm

  • Provided by: [C].Plants Of the World Online Portal - FWTA
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    • 1
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    Carpels 4 or more, free, stigmas peltate or umbonate

  • Provided by: [C].Plants Of the World Online Portal - FWTA
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    • 1
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    Aquatic herbs of saline marshes

  • Provided by: [C].Plants Of the World Online Portal - FWTA
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    • 1
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    Ovule solitary, pendulous

  • Provided by: [C].Plants Of the World Online Portal - FWTA
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    • 1
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    Ovaries 2-8, but usually 4, free, superior, sessile at first, becoming long-stipitate in fruit; ovule solitary, pendulous, campylotropous, crassinucellar; stigma sessile, peltate, ventroapical

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    • 2
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    Submerged monoecious glabrous aquatic herbs of alkaline or brackish water, sometimes in sea-water

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    Fruits ovoid-pyriform, often asymmetric, beaked drupes

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    Perianth absent

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    Stem slender, erect, branching freely, monopodial below, sympodial above

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    • 2
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    Stamens 2, opposite each other; filaments very short and broad; anthers 2-thecous, extrorse, the 2 relatively large pollen-sacs divergent and well separated; pollen-grains luniform and of a unique type, buoyant

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    Rhizome thin, matted, perennial, rooted in the substrate

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    Inflorescence usually a 2-flowered terminal spike with the flowers inserted at unequal heights and on opposite sides of the rachis, when young concealed in the sheath of the uppermost vegetative leaf, and just exserted above the water at anthesis; peduncle short or long, sometimes spirally coiled

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    Flowers bisexual, actinomorphic, protandrous, very small and inconspicuous

  • Provided by: [D].Plants Of the World Online Portal - FTEA
    • Source: [
    • 2
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    Leaves alternate or opposite; blade simple, linear or setaceous, with a single midvein; sheath wide, distally open

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    • 2
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    Seeds hard, without endosperm

  • Provided by: [D].Plants Of the World Online Portal - FTEA
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    • 2
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    Herbes'aquatiques submergées; rhizomes grêles, rampants, lacuneux, portant des racines adventives simples; tiges ± grêles; lacuneuses, à ramification monopodiale distique dans les parties végétatives, sympodiale au niveau de l'inflorescence; écailles étroites entourant la base des ramifications.'Feuilles'distiques, alternes, simples, à base engainante assez longue et soudée aux stipules, accompagnées de 2 petites squamules axillaires, ovales; limbe linéaire-filiforme, lacuneux, ± denticulé dans la région apicale. Inflorescences : épis terminaux courts, le plus souvent 2-flores, d'abord inclus dans les gaines spathiformes de 2 bractées subopposées, puis exserts; pédoncule grêle, lacuneux, initialement court mais allongé et parfois enroulé après la floraison.'Fleurs'bisexuées, à périanthe réduit à 2 tépales minuscules; étamines 2, opposées, à anthère subsessile, grande, à 2 thèques bisporangiées, extrorses, à déhiscence longitudinale, séparées par un connectif large; grains de pollen oblongs, coudés, ± renflés en leur milieu du côté convexe ainsi qu'aux extrémités, à exine mince, formant un fin réseau, discontinue sur les dilatations; carpelles (2-)4(-16), libres, d'abord sessiles, portés après la fécondation sur des podogynes; stigmates sessiles, peltés, en forme de bouclier, parfois déprimés; ovules solitaires, pendant du sommet de la loge, subatropes, bitégumentés.'Fruits'drupacés, pyriformes, souvent obliques, à endocarpe rostré, scléreux, présentant sous le rostre 2 fenêtres latérales parenchymateuses.'Graines à tégument double, exalbuminées; embryon à radicule latérale; hypocotyle hypertrophié latéralement et rempli de substances de réserve; cotylédon petit, cylindrique, ± incurvé, adossé à l'hypocotyle.\n\t\t\tFamille unigénérique, comportant 7 espèces, subcosmopolite, absente seulement des régions arctiques. Pour la Flore : 1 espèce.

  • Provided by: [B].Flore d'Afrique Centrale
    • Source: [
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    Literature

    SELECTED REFERENCES

    Haynes, R. R. 1978. The Potamogetonaceae in the Southeastern United States. J. Arnold Arbor. 59: 170--191.

  • Provided by: [A].Flora of North America @ efloras.org
    • Source: [
    • 4
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    Included Genus

    Other Local Names

    NameLanguageCountry
    Ditch-grass Family

     Information From

    Flora of North America @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=1
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • A Flora of North America Association
    Flore d'Afrique Centrale
    https://www.floredafriquecentrale.be
    • B http://creativecommons.org/licenses/by/4.0/ Attribution 4.0 International (CC BY 4.0)
    Plants Of the World Online Portal - FWTA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • C The Trustees of the Royal Botanic Gardens, Kew
    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • D
    Flora Of CHina @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=2
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • E Missouri Botanical Garden
    Ruppiaceae
    • F CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • G CC0 1.0 Universal (CC0 1.0).